DeWalt DW830:
- Powerful 1400-watt motor for demanding grinding and cutting tasks
- Versatile use as a grinder, sander, or cut-off tool
- Variable speed control (11,000 to 8,000 RPM) for precise adjustment to different materials and applications
- 125mm wheel diameter for a wide range of grinding and cutting discs
- Compact and lightweight design for easy handling and maneuverability
- Ergonomic grip for comfortable operation, even during extended use
- Safety features include spindle lock for easy wheel changes and a protective guard to minimize the risk of injury
DeWalt DW830:
- Powerful 1400-watt motor for demanding grinding and cutting tasks
- Versatile use as a grinder, sander, or cut-off tool
- Variable speed control (11,000 to 8,000 RPM) for precise adjustment to different materials and applications
- 125mm wheel diameter for a wide range of grinding and cutting discs
- Compact and lightweight design for easy handling and maneuverability
- Ergonomic grip for comfortable operation, even during extended use
- Safety features include spindle lock for easy wheel changes and a protective guard to minimize the risk of injury
DW830
DW840
B
Copyright DeWALT
English (original instructions) 5
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DW840
DW830
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English
5
MEDIUM ANGLE GRINDER
DW830/DW840
English (original instructions)
Congratulations!
You have chosen a DeWALT Power Tool. Years of
experience, thorough product development and
innovation make DeWALT one of the most reliable
partners for professional Power Tool users.
Technical Data
DW830 DW840
Voltage V
AC
220-240 220-240
Power input W 1400 1800
Rated speed min
-1
11000 8000
Wheel diameter mm 125 180
Max. wheel width mm 6.5 7.0
Spindle diameter M14 M14
Spindle length mm 19 19
Weight kg 3.1 4.0
Definitions: Safety Guidelines
The definitions below describe the level of severity
for each signal word. Please read the manual and
pay attention to these symbols.
DANGER: Indicates an imminently
hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING: Indicates a potentially
hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION: Indicates a potentially
hazardous situation which, if not avoided,
may result in minor or moderate
injury.
NOTICE: Indicates a practice not
related to personal injury which, if
not avoided, may result in property
damage.
Denotes risk of electric shock.
Denotes risk of fire.
WARNING: To reduce the risk of injury,
read the instruction manual.
General Power Tool Safety Warnings
WARNING! Read all safety warnings
and instructions Failure to follow the
warnings and instructions may result in
electric shock, fire and/or serious injury.
SAVE ALL WARNINGS AND INSTRUCTIONS
FOR FUTURE REFERENCE
The term “power tool” in the warnings refers
to your mains-operated (corded) power tool or
battery-operated (cordless) power tool.
1) WORK AREA SAFETY
a) Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
b) Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power
tools create sparks which may ignite the dust
or fumes.
c) Keep children and bystanders away while
operating a power tool. Distractions can
cause you to lose control.
2) ELECTRICAL SAFETY
a) Power tool plugs must match the outlet.
Never modify the plug in any way. Do
not use any adapter plugs with earthed
(grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of
electric shock.
b) Avoid body contact with earthed or
grounded surfaces such as pipes,
radiators, ranges and refrigerators. There
is an increased risk of electric shock if your
body is earthed or grounded.
c) Do not expose power tools to rain or wet
conditions. Water entering a power tool will
increase the risk of electric shock.
d) Do not abuse the cord. Never use the
cord for carrying, pulling or unplugging
the power tool. Keep cord away from
heat, oil, sharp edges or moving parts.
Damaged or entangled cords increase the
risk of electric shock.
e) When operating a power tool outdoors,
use an extension cord suitable for outdoor
use. Use of a cord suitable for outdoor use
reduces the risk of electric shock.
f) If operating a power tool in a damp
location is unavoidable, use a residual
current device (RCD) protected supply.
Use of an RCD reduces the risk of electric
shock.
3) PERSONAL SAFETY
a) Stay alert, watch what you are doing and
use common sense when operating a
power tool. Do not use a power tool while
you are tired or under the influence of
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drugs, alcohol or medication. A moment of
inattention while operating power tools may
result in serious personal injury.
b) Use personal protective equipment.
Always wear eye protection. Protective
equipment such as dust mask, non-skid
safety shoes, hard hat, or hearing protection
used for appropriate conditions will reduce
personal injuries.
c) Prevent unintentional starting. Ensure
the switch is in the off position before
connecting to power source and/or
battery pack, picking up or carrying the
tool. Carrying power tools with your finger
on the switch or energising power tools that
have the switch on invites accidents.
d) Remove any adjusting key or wrench
before turning the power tool on. A
wrench or a key left attached to a rotating
part of the power tool may result in personal
injury.
e) Do not overreach. Keep proper
footing and balance at all times. This
enables better control of the power tool in
unexpected situations.
f) Dress properly. Do not wear loose
clothing or jewellery. Keep your hair,
clothing and gloves away from moving
parts. Loose clothes, jewellery or long hair
can be caught in moving parts.
g) If devices are provided for the connection
of dust extraction and collection facilities,
ensure these are connected and properly
used. Use of dust collection can reduce
dust-related hazards.
4) POWER TOOL USE AND CARE
a) Do not force the power tool. Use the
correct power tool for your application.
The correct power tool will do the job
better and safer at the rate for which it
was designed.
b) Do not use the power tool if the switch
does not turn it on and off. Any power
tool that cannot be controlled with the switch
is dangerous and must be repaired.
c) Disconnect the plug from the power
source and/or the battery pack from
the power tool before making any
adjustments, changing accessories, or
storing power tools. Such preventive safety
measures reduce the risk of starting the
power tool accidentally.
d) Store idle power tools out of the reach
of children and do not allow persons
unfamiliar with the power tool or these
instructions to operate the power tool.
Power tools are dangerous in the hands of
untrained users.
e) Maintain power tools. Check for
misalignment or binding of moving parts,
breakage of parts and any other condition
that may affect the power tool’s operation.
If damaged, have the power tool repaired
before use. Many accidents are caused by
poorly maintained power tools.
f) Keep cutting tools sharp and clean.
Properly maintained cutting tools with sharp
cutting edges are less likely to bind and are
easier to control.
g) Use the power tool, accessories and
tool bits etc., in accordance with these
instructions taking into account the
working conditions and the work to
be performed. Use of the power tool for
operations different from those intended
could result in a hazardous situation.
5) SERVICE
a) Have your power tool serviced by a
qualified repair person using only identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
ADDITIONAL SPECIFIC SAFETY RULES
Safety Instructions for all Operations
a) This power tool is intended to function as
a grinder, sander or cut-off tool. Read all
safety warnings, instructions, illustrations
and specifications provided with this power
tool. Failure to follow all instructions listed below
may result in electric shock, fire and/or serious
injury.
b) Operations such as polishing and wire
brushing are not recommended to be
performed with this power tool. Operations
for which the power tool was not designed may
create a hazard and cause personal injury.
c) Do not use accessories which are not
specifically designed and recommended
by the tool manufacturer. Just because the
accessory can be attached to your power tool,
it does not assure safe operation.
d) The rated speed of the accessory must be at
least equal to the maximum speed marked
on the power tool. Accessories running faster
than their rated speed can break and fly apart.
e) The outside diameter and the thickness of
your accessory must be within the capacity
rating of your power tool. Incorrectly sized
accessories can not be adequately guarded or
controlled
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spinning accessory may grab the surface and
pull the power tool out of your control.
m) Do not run the power tool while carrying it at
your side. Accidental contact with the spinning
accessory could snag your clothing, pulling the
accessory into your body.
n) Regularly clean the power tool’s air vents.
The motor’s fan will draw the dust inside
the housing and excessive accumulation of
powdered metal may cause electrical hazards.
o) Do not operate the power tool near
flammable materials. Sparks could ignite these
materials.
p) Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
FURTHER SAFETY INSTRUCTIONS
FOR ALL OPERATIONS
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or
snagged rotating wheel or any other accessory.
Pinching or snagging causes rapid stalling of
the rotating accessory which in turn causes the
uncontrolled power tool to be forced in the direction
opposite of the accessory’s rotation at the point of
the binding.
For example, if an abrasive wheel is snagged or
pinched by the workpiece, the edge of the wheel
that is entering into the pinch point can dig into the
surface of the material causing the wheel to climb
out or kick out. The wheel may either jump toward or
away from the operator, depending on direction of the
wheel’s movement at the point of pinching. Abrasive
wheels may also break under these conditions.
Kickback is the result of tool misuse and/or incorrect
operating procedures or conditions and can be
avoided by taking proper precautions as given below:
a) Maintain a firm grip on the power tool and
position your body and arm to allow you to
resist kickback forces. Always use auxiliary
handle, if provided, for maximum control
over kickback or torque reaction during start
up. The operator can control torque reaction or
kickback forces, if proper precautions are taken.
b) Never place your hand near the rotating
accessory. Accessory may kickback over your
hand.
c) Do not position your body in the area where
power tool will move if kickback occurs.
Kickback will propel the tool in direction
opposite to the wheel’s movement at the point
of snagging.
f) Threaded mounting of accessories must
match the grinder spindle thread. For
accessories mounted by flanges, the arbour
hole of the accessory must fit the locating
diameter of the flange. Accessories that do
not match the mounting hardware of the power
tool will run out of balance, vibrate excessively
and may cause loss ofcontrol.
g) Do not use a damaged accessory. Before
each use inspect the accessory such
as abrasive wheel for chips and cracks.
If power tool or accessory is dropped,
inspect for damage or install an undamaged
accessory. After inspecting and installing
an accessory, position yourself and
bystanders away from the plane of the
rotating accessory and run the power tool
at maximum no-load speed for one minute.
Stop immediately if there is a considerable
vibration or if other defects are detected. If
this condition occurs, check the machine to
determine the cause. Always store the abrasive
wheel safely and on dry places outside of the
reach of children. Damaged accessories will
normally break apart during this test time.
h) Wear personal protective equipment.
Depending on application, use face
shield, safety goggles or safety glasses.
As appropriate, wear dust mask, hearing
protectors, gloves and shop apron capable
of stopping small abrasive or workpiece
fragments. The eye protection must be
capable of stopping flying debris generated by
various operations. The dust mask or respirator
must be capable of filtrating particles generated
by your operation. Prolonged exposure to high
intensity noise may cause hearing loss.
i) Keep bystanders a safe distance away from
work area. Anyone entering the work area
must wear personal protective equipment.
Fragments of workpiece or of a broken
accessory may fly away and cause injury
beyond immediate area of operation.
j) Hold the power tool by insulated gripping
surfaces only, when performing an operation
where the cutting accessory may contact
hidden wiring or its own cord. Cutting
accessory contacting a "live" wire may make
exposed metal parts of the power tool "live" and
could give the operator an electricalshock.
k) Position the cord clear of the spinning
accessory. If you lose control, the cord may be
cut or snagged and your hand or arm may be
pulled into the spinning accessory.
l) Never lay the power tool down until the
accessory has come to a complete stop. The
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b) Do not position your body in line with and
behind the rotating wheel. When the wheel,
at the point of operations, is moving away from
your body, the possible kickback may propel the
spinning wheel and the power tool directly at
you.
c) When wheel is binding or when interrupting
a cut for any reason, switch off the power
tool and hold the power tool motionless
until the wheel comes to a complete stop.
Never attempt to remove the cut-off wheel
from the cut while the wheel is in motion
otherwise kickback may occur. Investigate
and take corrective action to eliminate the cause
of wheel binding.
d) Do not restart the cutting operation in the
workpiece. Let the wheel reach full speed
and carefully re-enter the cut. The wheel may
bind, walk up or kickback if the power tool is
restarted in the workpiece.
e) Support panels or any oversized workpiece
to minimize the risk of wheel pinching and
kickback. Large workpieces tend to sag under
their own weight. Supports must be placed
under the workpiece near the line of cut and
near the edge of the workpiece on both sides of
the wheel.
f) Use extra caution when making a “pocket
cut” into existing walls or other blind areas.
The protruding wheel may cut gas or water
pipes, electrical wiring or objects that can cause
kickback.
Safety Warnings Specific for Sanding
Operations
a) Do not use excessively oversized sanding
disc paper. Follow manufacturer’s
recommendations, when selecting sanding
paper. Larger sanding paper extending beyond
the sanding pad presents a laceration hazard
and may cause snagging, tearing of the disc
or kickback.
Additional Safety Information
• Threadedmountingofaccessoriesmustmatch
the grinder spindle thread. For accessories
mounted by flanges, the arbor hole of the
accessory must fit the locating diameter of
the flange. Accessories that do not match the
mounting hardware of the power tool will run
out of balance, vibrate excessively and may
cause loss of control.
• Thegrindingsurfaceofthecentredepressed
wheels must be mounted below the plane of
the guard lip. An improperly mounted wheel
d) Use special care when working corners,
sharp edges etc. Avoid bouncing and
snagging the accessory. Corners, sharp
edges or bouncing have a tendency to snag the
rotating accessory and cause loss of control or
kickback.
e) Do not attach a saw chain woodcarving
blade or toothed saw blade. Such blades
create frequent kickback and loss of control.
Safety Warnings Specific for
Grinding and Cutting-Off Operations
a) Use only wheel types that are recommended
for your power tool and the specific guard
designed for the selected wheel. Wheels for
which the power tool was not designed cannot
be adequately guarded and are unsafe.
b) The grinding surface of centre depressed
wheels must be mounted below the plane
of the guard lip. An improperly mounted wheel
that projects through the plane of the guard lip
cannot be adequatelyprotected.
c) The guard must be securely attached to the
power tool and positioned for maximum
safety, so the least amount of wheel is
exposed towards the operator. The guard
helps to protect the operator from broken wheel
fragments, accidental contact with wheel and
sparks that could igniteclothing.
d) Wheels must be used only for recommended
applications. For example: do not grind with
the side of cut-off wheel. Abrasive cut-off
wheels are intended for peripheral grinding, side
forces applied to these wheels may cause them
toshatter.
e) Always use undamaged wheel flanges
that are of correct size and shape for your
selected wheel. Proper wheel flanges support
the wheel thus reducing the possibility of wheel
breakage. Flanges for cut-off wheels may be
different from grinding wheelflanges.
f) Do not use worn down wheels from larger
power tools. Wheel intended for larger power
tool is not suitable for the higher speed of a
smaller tool and mayburst.
Additional Safety Warnings Specific
for Abrasive Cutting-Off Operations
a) Do not “jam” the cut-off wheel or apply
excessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibility to
twisting or binding of the wheel in the cut and
the possibility of kickback or wheel breakage.
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• Checkfordamagetothetool,partsor
accessories which may have occurred
during transport.
• Takethetimetothoroughlyreadand
understand this manual prior to operation.
Description (fig. A)
WARNING: Never modify the power
tool or any part of it. Damage or personal
injury could result.
1 ON/OFF-switch
2 Lock-off button
3 Side handle
4 Guard
5 Spindle lock
INTENDED USE
Your DW830/DW840 heavy-duty angle grinders
have been designed for professional grinding,
sanding and cutting-off applications.
DO NOT use under wet conditions or in the
presence of flammable liquids or gases.
DO NOT use grinding wheels other than fibre
reinforced centre depressed wheels and flap-disk.
These heavy-duty angle grinders are professional
power tools.
DO NOT let children come into contact with the
tool. Supervision is required when inexperienced
operators use this tool.
• Young children and the infirm. This appliance
is not intended for use by young children or
infirm persons without supervision.
• Thisproductisnotintendedforusebypersons
(including children) suffering from diminished
physical, sensory or mental abilities; lack of
experience, knowledge or skills unless they are
supervised by a person responsible for their
safety. Children should never be left alone with
this product.
Electrical Safety
The electric motor has been designed for one
voltage only. Always check that the power supply
corresponds to the voltage on the rating plate.
Your DeWALT tool is double insulated in
accordance with IEC60745; therefore no
earth wire is required.
If the supply cord is damaged, it must be replaced
by a specially prepared cord available through the
DeWA LT service organization.
that projects through the plane of the guard lip
cannot be adequately protected.
• Thistoolisnotdesignedtobeusedwithwire
wheels and wire cup.
WARNING: We recommend the use of
a residual current device with a residual
current rating of 30mA or less.
Residual Risks
In spite of the application of the relevant safety
regulations and the implementation of safety
devices, certain residual risks cannot be avoided.
These are:
– Impairment of hearing
– Risk of personal injury due flying particles.
– Risk of burns due to accessories becoming hot
during operation.
– Risk of personal injury due to prolonged use.
– Risk of dust from hazardous substances.
Markings on Tool
In addition to the pictographs used in this
manual, the labels on the tool show the following
pictographs:
Read instruction manual before use.
Wear safety glasses.
Wear ear protection.
DATE CODE POSITION (FIG. A)
The Date Code (16), which also includes the year of
manufacture, is printed into the housing.
Example:
2016 XX XX
Year of Manufacture
Package Contents
The package contains:
1 Angle grinder
1 Guard
1 Side handle
1 Flange set
1 Two-pin spanner
1 Instruction manual
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• Presstheguard(8)downandturnitinthe
direction of the arrow (fig. B2).
• Securelytightenthescrews(10).
DW840 - REMOVING
• Toremovetheguard,proceedinreverseorder.
Mounting and Removing a Grinding
Wheel (fig. D, E)
• Placethetoolonatable,guardup.
• Fitthebackingflange(11)correctlyontothe
spindle (12).
• Placethegrindingwheelonthebackingflange.
• Screwthethreadedflange(14)ontothe
spindle (12).
• Pressthespindlelock(5)androtatethe
grinding wheel until it locks in position.
• Tightenthethreadedflangeusingthetwo-pin
spanner (13) supplied.
• Releasethespindlelock.
• Toremovethegrindingwheel,loosenthe
threaded flange using the two-pin spanner
(while the spindle lock is engaged).
Fitting and Removing a
Backing Pad/Sanding Sheet
(fig. D, E)
• Place the tool on a table, guard up.
• Remove the backing flange (11).
• Place the rubber backing pad correctly onto the
spindle (12).
• Place the sanding sheet on the rubber backing
pad.
• Screw the threaded clamp nut (14) onto the
spindle. The ring on the threaded clamp nut
(14) must face towards the rubber backing pad.
• Press the spindle lock button (5) and rotate the
spindle (12) until it locks in position.
• Tighten the threaded clamp nut (14) with the
two-pin spanner.
• Release the spindle lock
• To remove the rubber backing pad, loosen
the threaded clamp nut (14) wih the two-pin
spanner.
Prior to Operation
• Installtheappropriateguardanddiskorwheel.
Do not use excessively worn disks or wheels.
• Donotuseadamagedaccessory.Beforeeach
use inspect the accessory such as abrasive
wheels for chips and cracks, backing pad for
Using an Extension Cable
If an extension cable is required, use an approved
3–core extension cable suitable for the power input
of this tool (see Technical Data).The minimum
conductor size is 1.5 mm
2
; the maximum length
is 30 m.
When using a cable reel, always unwind the cable
completely.
ASSEMBLY AND ADJUSTMENT
WARNING: To reduce the risk
of serious personal injury, turn
tool off and disconnect tool from
power source before making any
adjustments or removing/installing
attachments or accessories.Before
reconnecting the tool, depress and
release the trigger switch to ensure that
the tool is off. An accidental start-up can
cause injury.
Attaching the Side Handle (fig. F)
WARNING: Beforeusingthetool,check
that the handle is tightened securely.
WARNING: The side handle should
always be used to maintain control of the
tool at all times.
Screw the side handle (3) tightly into one of the
holes (15) on either side of the gear case.
Mounting and Removing the Guard
WARNING: Guards must be used with
this grinder.
DW830 - MOUNTING (FIG. B1 & C)
• Placetheanglegrinderonatable,spindleup.
• Alignthelug(6)withtheslot(7)inthebracket.
• Presstheguard(8)downandturnitinthe
direction of the arrow (fig. B1).
WARNING: The guard locking pin (9)
prevents the guard from coming loose.
DW830 - REMOVING (FIG. B1 & C)
• Placetheanglegrinderonatable,spindleup.
• Rotatetheguard(8)inthedirectionofthearrow
(fig. C).
• Useascrewdrivertopressthelockingpin(9)in
the slot.
• Releasetheguard.
DW840 - MOUNTING (FIG. B2 & C)
• Placetheanglegrinderonatable,spindleup.
• Alignthelugs(6)withtheslots(7).
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own weight. Supports must be placed
under the workpiece near the line of cut
and near the edge of the workpiece on
both sides of the wheel.
•Alwayswearregularworkinggloves
while operating this tool.
•Thegearcasebecomesveryhot
during use.
•Applyonlyagentlepressuretothe
tool. Do not exert side pressure on the
disc.
•Avoidoverloading.Shouldthetool
become hot, let it run a few minutes
under no load condition to cool the
accessory. Do not touch accessories
before they have cooled. The discs
become very hot during use.
•Donotuseseparatereducingbushings
or adapters to adapt large hole
abrasive wheels.
•Neverusethetoolwithouttheguardin
place.
•Thetoolisnotdesignedtobeused
with a grinding cup.
•Donotusethepowertoolwithacut-
off stand.
•Neveruseblotterstogetherwith
bonded abrasive products.
•Beaware,thewheelcontinuesto
rotate after the tools is switched off.
Proper Hand Position (fig. A, H)
WARNING: To reduce the risk of serious
personal injury, ALWAYS use proper
hand position as shown.
WARNING: To reduce the risk of serious
personal injury, ALWAYS hold securely in
anticipation of a sudden reaction.
Proper hand position requires one hand on the side
handle (3), with the other hand on the body of the
tool, as shown in figure H.
Switching On and Off (fig. G)
WARNING: Beforeusingtool,check
that the handle is tightened securely.
CAUTION: Hold the side handle and
body of the tool firmly to maintain control
of the tool at start up and during use
and until the wheel or accessory stops
rotating. Make sure the wheel has come
to a complete stop be fore laying the tool
down.
cracks, tear or excess wear, wire brush for loose
or cracked wires. If power tool or accessory
is dropped, inspect for damage or install an
undamaged accessory. After inspecting and
installing an accessory, position yourself and
bystanders away from the plane of the rotating
accessory and run the power tool at maximum
no-load speed for one minute. Damaged
accessories will normally break apart during this
test time.
• Besuretheinnerandouterflangearemounted
correctly. Follow the instructions given in the
Grinding and Cutting Accessory Chart.
• Makesurethediskorwheelrotatesinthe
direction of the arrows on the accessory and
the tool.
• Donotusecutting-offwheelsforsidegrinding.
• Ensurethatsparksresultingfromusedonot
create hazard e.g. do not hit persons, or ignite
flammable substances.
OPERATION
Instructions for Use
WARNING: Always observe the safety
instructions and applicable regulations.
WARNING: To reduce the risk
of serious personal injury, turn
tool off and disconnect tool from
power source before making any
adjustments or removing/installing
attachments or accessories.Before
reconnecting the tool, depress and
release the trigger switch to ensure that
the tool is off.
WARNING:
•Ensureallmaterialstobegroundorcut
are secured in place.
•Use clamps or a vice to hold
and support the workpiece to a
stable platform. It is important to
clamp and support the workpiece
securely to prevent the movement
of the workpiece and loss of control.
Movement of the workpiece or loss of
control may create a hazard and cause
personal injury.
•Securetheworkpiece.Aworkpiece
clamped with clamping devices or in a
vice is held more secure than by hand.
•Supportpanelsoranyoversized
workpiece to minimize the risk of
wheel pinching and kickback. Large
workpieces tend to sag under their
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Rough Grinding
Never use a cutting disc for roughing.
Always use the guard type 27.
The best roughing results are achieved when setting
the machine at an angle of 30° to 40° . Move the
machine back and forth with moderate pressure. In
this manner, the workpiece will not become too hot,
does not discolour and no grooves are formed.
Cutting Stone
The machine shall be used only for dry cutting.
For cutting stone, it is best to use a diamond cutting
disc.
Operate the machine only with additional dust
protection mask.
Working Advice
Exercise caution when cutting slots in
structural walls.
Slots in structural walls are subject to the country-
specific regulations. These regulations are to be
observed under all circumstances.
Before beginning work, consult the responsible
structural engineer, architect or the construction
supervisor.
MAINTENANCE
Your DeWALT power tool has been designed to
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular
cleaning.
WARNING: To reduce the risk
of serious personal injury, turn
tool off and disconnect tool from
power source before making any
adjustments or removing/installing
attachments or accessories.Before
reconnecting the tool, depress and
release the trigger switch to ensure that
the tool is off. An accidental start-up can
cause injury.
Pop-off Brushes
The motor will be automatically shut off indicating
that the carbon brushes are nearly worn out and
that the tool needs servicing. The carbon brushes
are not user-serviceable. Take the tool to an
authorised DeWALT repair agent.
• Torunthetool,pressthelock-offbutton(2)and
the On/Off switch (1).
• Tostopthetool,releasetheOn/Offswitch.
WARNING: Do not switch the tool On or
Off when under load.
Spindle Lock (fig. A)
The spindle lock (5) is provided to prevent the
spindle from rotating when installing or removing
wheels. Operate the spindle lock only when the tool
is turned off, unplugged from the power supply, and
has come to a complete stop.
NOTICE: To reduce the risk of damage
to the tool, do not engage the spindle
lock while the tool is operating. Damage
to the tool will result and attached
accessory may spin off possibly resulting
in injury.
To engage the lock, depress the spindle lock button
and rotate the spindle until you are unable to rotate
the spindle further.
Metal Applications
When using the tool in metal applications, make
sure that a residual current device (RCD) has been
inserted to avoid residual risks caused by metal
swarf.
If the power supply is shut off by the RCD, take the
tool to authorised DeWALT repair agent.
WARNING: In extreme working
conditions, conductive dust can
accumulate inside the machine housing
when working with metal. This can result
in the protective insulation in the machine
becoming degraded with a potential risk
of an electrical shock.
To avoid build-up of metal swarf inside the machine,
we recommend to clear the ventilation slots on a
daily basis. See Maintenance.
Using Flap Discs
WARNING: Metal dust build-up.
Extensiveuseofflapdiscsinmetal
applications can result in the increased
potential for electric shock. To reduce
this risk, insert an RCD before use and
clean the ventilation slots daily by blowing
dry compressed air into the ventilation
slots inaccordance with the below
maintenance instructions.
13
English
Protecting the Environment
Separate collection. Products and
batteries marked with this symbol
must not be disposed of with normal
household waste.
Products and batteries contain materials that can
be recovered or recycled reducing the demand for
raw materials. Please recycle electrical products
and batteries according to local provisions. Further
information is available at www.2helpU.com.
Lubrication
Your power tool requires no additional lubrication.
Cleaning
WARNING:Blowdirtanddustoutof
the main housing with dry air as often as
dirt is seen collecting in and around the
air vents. Wear approved eye protection
and approved dust mask when
performing this procedure.
WARNING: Never use solvents or
other harsh chemicals for cleaning the
non-metallic parts of the tool. These
chemicals may weaken the materials
used in these parts. Use a cloth
dampened only with water and mild
soap. Never let any liquid get inside the
tool; never immerse any part of the tool
into a liquid.
Optional Accessories
WARNING: Since accessories, other
than those offered by DeWA LT, have
not been tested with this product, use
of such accessories with this tool could
be hazardous. To reduce the risk of
injury, only DeWALT, recommended
accessories should be used with this
product.
Consult your dealer for further information on the
appropriate accessories.
ACCESSORY TABLE
Max.
[mm]
[mm]
Min.
Rotation
[min.
-1
]
Periphical
speed
[m/s]
Threaded
hole
length
[mm]
D b d
d
D
b
DW830
125
8
22.23
DW830
11000
80
-
-
DW840
180
DW840
8000
D
DW830
125
- -
DW830
11000
80 -
DW840
180
DW840
8000
14
English
GRINDING AND CUTTING ACCESSORY CHART
Guard Type Accessory Description How to Fit Grinder
TYPE 27
GUARD
Depressed
centre grinding
disc
Type 27 guard
Backing flange
Type 27 depressed
centre wheel
Threaded clamp nut
Flap wheel
Backing pad/
sanding sheet
Type 27 guard
Rubber backing pad
Sanding disc
Threaded clamp nut
TYPE 27
GUARD
Diamond
cutting wheels
Type 27 guard
Backing flange
Cutting wheel
Threaded clamp nut
N472227 04/2016
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DeWalt DW830:
- Powerful 1400-watt motor for demanding grinding and cutting tasks
- Versatile use as a grinder, sander, or cut-off tool
- Variable speed control (11,000 to 8,000 RPM) for precise adjustment to different materials and applications
- 125mm wheel diameter for a wide range of grinding and cutting discs
- Compact and lightweight design for easy handling and maneuverability
- Ergonomic grip for comfortable operation, even during extended use
- Safety features include spindle lock for easy wheel changes and a protective guard to minimize the risk of injury
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